# memoryOS vs VisualGrammar

The clearest difference is review sentiment: memoryOS at 80% against VisualGrammar's 0%. memoryOS also leads on price (Free vs $3.99) and rating (4.9 vs 3.5). VisualGrammar's advantage is in-app purchases (none vs 10). On update cadence, ads and device support there is nothing between them.

memoryOS is free to download; VisualGrammar costs $3.99 up front. memoryOS sells 9 in-app purchases, starting at $5.99 per month. VisualGrammar asks for nothing beyond the download.

memoryOS holds the better App Store score, 4.9 against 3.5. That said, the two scores are not equally well evidenced: memoryOS has 17K ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 80% of memoryOS's written reviews are positive against 0% of VisualGrammar's.

memoryOS ships an update fortnightly, VisualGrammar every 10 days. The most recent releases landed on November 12, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | memoryOS | VisualGrammar |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | **[4.9 (17K ratings)](https://appshunter.io/ios/app/memoryos-memory-games/id1553283646/reviews)** | [3.5 (2 ratings)](https://appshunter.io/ios/app/visualgrammarsentence-diagram/id6470222379/reviews) |
| Number of ratings | **17K** | 2 |
| Positive reviews | **80.2% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 10 days** |
| Monetization | **Free with in-app purchases** | Paid |
| Best chart rank | **#54** | — |
| Size | 232 MB | 16 MB |
| Requires iOS | **15.2** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Encoder Inc.](https://appshunter.io/developer/1524669695) | [Simin Dai](https://appshunter.io/developer/1231564112) |

## What reviewers say

### memoryOS

[App page](https://appshunter.io/ios/app/memoryos-memory-games/id1553283646)

**Currently charting:** #54 Top Grossing · Education, #108 Top Free · Education (US App Store)

Enhance your memory with interactive lessons and a 3D virtual mind palace game. This app uses scientifically proven techniques like spaced repetition to boost long-term memory storage and knowledge retention. It's designed to make memorization skills joyful and effective for everyone.

**Highlights:** Interactive memory lessons, 3D Virtual Mind Palaces, Spaced repetition system, Gamified learning, Memorize names, lists, numbers, and more, Advanced study techniques

**Features:** Vision Pro support

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Student Monthly Plan | $5.99 | per month |
| Essential Weekly Plan | $6.99 | per 7 days |
| Essential Monthly Plan | $15.99 | per month |
| Expert Monthly Plan | $27.99 | per month |
| Essential Annual Plan | $89.99 | per year |
| Expert Annual Plan | $148.99 | per year |
| Expert Annual Plan | $149.99 | per year |
| Expert Annual Plan | $159.99 | per year |
| Expert Annual Plan | $159.99 | per year |

**What reviewers like**

- 🚀 Effective memory techniques
- 👍 Interactive and engaging
- 💡 Innovative use of memory palaces
- 🤩 Impressive results in a short time
- 🎉 Fun and enjoyable to use

**What reviewers complain about**

- 💰 Expensive subscription model
- 🐛 Buggy and crashes frequently
- 🤔 Confusing navigation and UI
- 🔒 Lack of transparency around pricing
- 🙄 Aggressive upselling and marketing tactics

**Reported bugs**

- Login issues and account management problems
- Frequent crashes and app instability
- Navigation and UI elements not working as expected
- Syncing issues between devices and lost progress
- Connectivity problems when using cellular data

**Requested features**

- More free content and lessons
- Ability to create custom memory palaces
- Better progress tracking and analytics
- Integration with other learning/productivity apps
- Offline mode for lessons and memory palaces


### VisualGrammar

[App page](https://appshunter.io/ios/app/visualgrammarsentence-diagram/id6470222379)

This app uses an AI-powered model inspired by Reed–Kellogg diagrams to automatically generate visual representations of sentence structure. It works offline, making grammar analysis accessible and engaging for students and language enthusiasts.

**Highlights:** Automatic sentence diagram generation, Offline functionality, Lightweight AI model, Visualizes grammar, Privacy-first design

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is memoryOS free?

memoryOS is free to download, with in-app purchases available.

### Is VisualGrammar free?

VisualGrammar costs $3.99, with no in-app purchases.

### Which has better reviews, memoryOS or VisualGrammar?

memoryOS is rated higher. memoryOS averages 4.9 out of 5 from 17K ratings, while VisualGrammar averages 3.5 from 2 ratings.

### Do memoryOS or VisualGrammar have ads?

Neither memoryOS nor VisualGrammar shows ads.

### Which is updated more often, memoryOS or VisualGrammar?

memoryOS ships an update fortnightly, and VisualGrammar every 10 days. Most recently, memoryOS was updated on November 12, 2026 and VisualGrammar on November 7, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*